CN103728346A - Automatic-cleaning water quality signal device - Google Patents
Automatic-cleaning water quality signal device Download PDFInfo
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- CN103728346A CN103728346A CN201310713173.3A CN201310713173A CN103728346A CN 103728346 A CN103728346 A CN 103728346A CN 201310713173 A CN201310713173 A CN 201310713173A CN 103728346 A CN103728346 A CN 103728346A
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Abstract
The invention discloses an automatic-cleaning water quality signal device. The automatic-cleaning water quality signal device consists of a probe, a power supply module, a signal processing module, a high-frequency signal generator module and a timer module, wherein the probe consists of an epoxy resin shell, leads, conductivity electrodes and piezoelectric ceramic crystal oscillator sheets; when the water quality changes to a certain degree, the signal processing module drives a contactor, so that an alarming device alarms or a water quality treatment device is started to treat the water quality; the timer module sends control signals each day regularly; the high-frequency generator module generates high-frequency signals; the piezoelectric ceramic crystal oscillator sheets in the probe oscillate so as to generate ultrasonic waves and clean scales on the surfaces of the conductivity electrodes. The automatic-cleaning water quality signal device provided by the invention monitors water quality of cooling water online, timely treats quality of cooling water, prevents scaling on the surfaces of heat exchange pipes after water quality deterioration to lead to heat transfer effect reduction, is simple in structure, runs reliably, cleans timing for the conductivity electrodes or starting manually, and guarantees that the rear surfaces of the conductivity electrodes are not scaled, so that the detection signals reflect the water quality situation truly and reliably.
Description
Technical field:
The present invention relates to power transformer field, refer in particular to a kind of water quality signalling means for strong recycle oil-water cooling system.
Background technology
The soft water that the chilled water of strong recycle oil-water cooling transformer adopts deionization to process conventionally, along with the prolongation of working time, cooling water quality can decline gradually, causes heat exchange tube wall incrustation to reduce heat transfer effect, therefore must detect in time the water quality of chilled water.
The water monitor of existing transformer forced circulation oil-hydrocooler can be divided into two large classes, by the water monitor of detection chilled water penetrability with by detecting the water monitor of chilled water conductivity.When cooling water quality degenerates, the penetrability variation of chilled water, conductivity raises, this two classes water monitor respectively by detect the penetrability of chilled water and conductivity degenerate sign other cooling water quality situation, when cooling water quality degenerates to a certain extent, give the alarm to remind and carry out water treatment or directly start Water-quality treater carrying out water treatment.The water monitor complex structure that detects chilled water penetrability in this two classes water monitor, price is higher; The water monitor that detects conductivity is simple in structure, cheap, uses more in common power transformer.
Which kind of water monitor no matter, when detecting head surface fouling, all will affect actual detection effect, the water monitor probe fouling that detects chilled water penetrability will affect the detection of chilled water penetrability, the erroneous judgement of generation penetrability, and detect the detection that can affect conductivity after the water monitor probe fouling of chilled water conductivity, produce conductivity and judge by accident.After penetrability or conductivity generation erroneous judgement, water monitor detects data can not truly reflect water quality actual state, often when cooling water quality is fair, gives the alarm or starts Water-quality treater, has increased the actual motion cost of transformer.
For the work that guarantees that water monitor is true and reliable, the probe of water monitor must regularly clean, and the probe of existing water monitor must remove and carry out manual cleaning from equipment, not only wastes time and energy, also the direct normal operation that affects equipment.
Summary of the invention:
The object of invention is that a kind of water quality signalling means for the on-line monitoring of the strong recycle oil-water cooling of large-capacity power transformer Cooling water water quality will be provided, when being reduced to, cooling water quality sets index when following, give the alarm, remind and carry out in time cooling water quality processing, and can realize probe and regularly automatically clean, remove probe fouling, guarantee the true and reliable actual water quality condition of reflection of detection signal of water quality signalling means.
Technical scheme, principle is that piezoelectric ceramics crystal-vibration-chip is installed at the conductance electrode back side, then with epoxy resin, piezoelectric ceramics crystal-vibration-chip, conductance electrode die casting are popped one's head in forming together, to pop one's head in and insert in chilled water, conductance electrode is connected with signal processing circuit, when water quality changes, output signal is reminded and to be carried out in time water treatment, or automatically starts treatment device for water and carry out water treatment; In addition, regularly produce high-frequency oscillation signal with the high frequency signal generator module that in probe, piezoelectric ceramics crystal-vibration-chip is connected, by lead-in wire, be transferred to piezoelectric ceramics crystal-vibration-chip and make crystal-vibration-chip generation of vibration ultrasound wave, utilize ultrasound wave to clean conductance electrode, remove conductance electrode surface scale.
Enforcement the inventive system comprises probe, power module, signal processing module, high frequency signal generator module, timer module.Power module drives signal processing module, timer module, the work of high frequency signal generator module, power module connects signal processing module, signal processing module connects timer module, timer module connects high frequency signal generator module, probe is connected with heat interchanger by housing, conductance electrode in probe is connected with signal processing module by lead-in wire, and the piezoelectric ceramics crystal-vibration-chip in probe is connected with high frequency signal generator module by lead-in wire.
Described probe comprises epoxy resin housing, lead-in wire, conductance electrode, piezoelectric ceramics crystal-vibration-chip forms, piezoelectric ceramics crystal-vibration-chip is arranged on the conductance electrode back side, and with epoxy resin die casting together, between conductance electrode and piezoelectric ceramics crystal-vibration-chip, pass through epoxy resins insulation, in the middle of epoxy resin housing, have window, guarantee that conductance electrode contacts with chilled water, two conductance electrodes respectively with conductance electrode contact b1, b2 joins, the piezoelectric ceramics crystal-vibration-chip of two parallel connections ipsilateral not respectively with piezoelectric ceramics contact a1, a2 is connected, piezoelectric ceramics crystal-vibration-chip is to carrying out timing or manually starting cleaning to conductance electrode.
Described power module is comprised of transformer, rectifier, Voltage stabilizing module, capacitor, transformer is 12V alternating current by the step-down of 220V alternating current, the bridge rectifier circuit being comprised of four commutation diodes is Rectified alternating current by 12V AC rectification, after the filter regulator circuit filtering of capacitor, three-terminal voltage-stabilizing module composition, voltage stabilizing, obtain 12V constant voltage source, drive signal processing module, timer module, high frequency signal generator module.
Described signal processing module is comprised of resistance, variable resistor, integrated operational amplifier, power switch pipe, diode and relay, variable resistor is demarcated for standard water quality, integrated operational amplifier and resistance form rp-op amp, when change of water quality to a certain extent, the saturated output of integrated operational amplifier, driving power switching tube saturation conduction, connects contactor coil circuit, and contactor drives warning device to report to the police or starts treatment device for water and carries out water treatment.
Described timer module is comprised of resistance, variable resistor, capacitor, two unijunction transistors, thyristors, unijunction transistor and capacitor, resistance form secondary vein and rush regularly part of trigger circuit formation timer, when timing part output signal, trigger thyristor conducting, to high frequency signal generator module, send driving signal.
Described high frequency signal generator module is comprised of Schmidt trigger module, capacitor, resistance, and Schmidt trigger and capacitor, resistance form without stable state self-maintained circuit, output high-frequency pulse signal.
In the present invention, for simplicity, following noun substitutes with letter: T: transformer ZVD: rectifier C1～C6: capacitor R1～R13: resistance PR1, PR2: variable resistor J1: integrated operational amplifier V1: power switch pipe VD1, VD2. diode K.: contactor coil KV1, KV2: unijunction transistor GT1: thyristor a1, a2.: piezoelectric ceramics contact b1, b2: conductance electrode contact SB1: start button
Implement the present invention, can carry out on-line monitoring to cooling water quality, in time chilled water is carried out to water treatment, avoid at heat exchanger tube surface structure, causing that heat-transfer effect reduces after water quality deterioration; The present invention is simple in structure, reliable, by conductance electrode fixed time cleaning, guarantees conductance electrode back side non-scaling, makes the true and reliable reflection water quality condition of detection signal.
Accompanying drawing explanation
Fig. 1 water quality signalling means circuit diagram schematic diagram
Fig. 2 water quality signal probe structural representation
Number in the figure title 1. epoxy resin housing 2. lead-in wire 3. piezoelectric ceramics 4. conductance electrode 5. power module 6. signal processing module 7. time block 8. high frequency signal generator module 9. three-terminal voltage-stabilizing module 10 Schmidt trigger modules
Embodiment
Below in conjunction with accompanying drawing, illustrate implementation process of the present invention.As shown in Figure 1, sonde configuration as shown in Figure 2 for circuit theory of the present invention.
Enforcement the inventive system comprises probe, power module 5, signal processing module 6, timer module 7, high frequency signal generator module 8.Power module 5 drives signal processing module 6, timer module 7,8 work of high frequency signal generator module, power module 5 connects signal processing module 7, signal processing module 7 connects timer module 9, timer module 9 connects high frequency signal generator module 8, probe is connected with heat interchanger by housing, conductance electrode 4 in probe is connected with signal processing module 7 by lead-in wire 2, and the piezoelectric ceramics crystal-vibration-chip 3 in probe is connected with high frequency signal generator module 8 by lead-in wire 2.
Described probe comprises epoxy resin housing 1, lead-in wire 2, conductance electrode 4, piezoelectric ceramics crystal-vibration-chip 3 forms, piezoelectric ceramics crystal-vibration-chip 3 is arranged on conductance electrode 4 back sides, and with epoxy resin die casting together, between conductance electrode 4 and piezoelectric ceramics crystal-vibration-chip 3, pass through epoxy resins insulation, in the middle of epoxy resin housing, have window, guarantee that conductance electrode 4 contacts with chilled water, two conductance electrodes 4 respectively with conductance electrode contact b1, b2 joins, the piezoelectric ceramics crystal-vibration-chip 3 of two parallel connections ipsilateral not respectively with piezoelectric ceramics contact a1, a2 is connected, piezoelectric ceramics crystal-vibration-chip is to carrying out timing or manually starting cleaning to conductance electrode.As shown in Figure 2.
Described power module 5 is comprised of transformer T, rectifier ZVD, Voltage stabilizing module 9, capacitor C1, C2, transformer T is 12V alternating current by the step-down of 220V alternating current, by bridge rectifier ZVD, by 12V AC rectification, be Rectified alternating current, after the filter regulator circuit filtering forming through capacitor C1, C2, three-terminal voltage-stabilizing module 9, voltage stabilizing, obtain 12V constant voltage source, drive signal processing module 6, timer module 7, high frequency signal generator module 8.
Described signal processing module 6 is comprised of resistance R 1, R2, R3, R4, variable resistor PR1, integrated operational amplifier J1, power switch pipe V1, diode VD1 and relay K, and variable resistor PR1 and resistance R 1 form bleeder circuit; Integrated operational amplifier J1 and resistance R 2, R3, R4 form rp-op amp, wherein R2 is in-phase end input resistance, R3 is stake resistance, and R4 is in-phase end and the output terminal that feedback resistance is connected on integrated operational amplifier J1, between conductance electrode power supply and end of oppisite phase; The base stage of power switch pipe V1 is connected on the output terminal of integrated operational amplifier J1, and diode VD1 and relay coil K are connected on power switch pipe V1 collector, and VD1 is fly-wheel diode.By standard water quality, demarcate the resistance of variable resistor PR1, demarcate the in-phase end current potential of integrated operational amplifier J1, when change of water quality to a certain extent, the saturated output of integrated operational amplifier J1, driving power switching tube V1 saturation conduction, connects contactor coil K circuit, and contactor drives warning device to report to the police or starts treatment device for water and carries out water treatment, when power switch pipe turn-offs, contactor coil K is by diode VD1 release current.
Described timer module 7 is comprised of resistance R 5～R12, variable resistor PR2, capacitor C3～C5, unijunction transistor KV1, KV2 and thyristor GT1.Unijunction transistor KV1 and capacitor C3, resistance R 5, R6, variable resistor PR2 form first order trigger circuit, power supply makes C3 potential rise by variable resistor PR2 to capacitor C3 charging, when capacitor C2 current potential surpasses the evoked potential of unijunction transistor KV1, KV1 conducting, C3 is by unijunction transistor KV1, resistance R 6 electric discharges, C3 current potential reduces, when C3 current potential lower than unijunction transistor KV1 maintain voltage time, unijunction transistor KV1 cut-off; Diode VD2, capacitor C4, resistance R 7～R9, unijunction transistor KV2 form second level trigger circuit, when KV1 conducting, power supply charges to capacitor C4 by R5, unijunction transistor KV1, diode VD2, when capacitor C4 current potential surpasses the evoked potential of unijunction transistor KV2, unijunction transistor KV2 conducting, C4 is by 9 electric discharges of resistance R 7, unijunction transistor KV2, resistance R, when the current potential of capacitor C2 lower than unijunction transistor KV2 maintain voltage time, unijunction transistor KV2 cut-off; When unijunction transistor KV2 conducting, by resistance R 10, to thyristor GT1, control utmost point output trigger pip, thyristor GT1 conducting, to radio-frequency generator module output trigger pip, after thyristor conducting, power supply by resistance R 11, thyristor GT1, resistance R 12, make the lifting of capacitor C5 current potential to capacitor C5 charging, reduces potential difference (PD) between thyristor GT1 negative electrode and anode, when potential difference (PD) between thyristor GT1 negative electrode, negative electrode is less than while maintaining voltage, thyristor GT1 cut-off.The resistance of adjusting variable resistor PR2 can change the output recurrence interval of first order unijunction transistor trigger circuit, thereby changes the time interval of whole timer module output trigger pip.
Described high frequency signal generator module 8 is comprised of Schmidt trigger module 10, capacitor C6, resistance R 13, and Schmidt trigger 10 and capacitor C6, resistance R 13 form without stable state self-maintained circuit, output high-frequency pulse signal; When the far-end control end of schmidt trigger module 10 receives the control signal of thyristor GT1 output, without stable state self-maintained circuit, start working, produce high-frequency pulse signal, by terminals b1, b2, be transferred to the piezoelectric ceramics crystal-vibration-chip in probe, there are vibrations and produce ultrasound wave in piezoelectric ceramics crystal-vibration-chip, ultrasonic propagation, to conductance electrode, causes conductance electrode vibrations, window side at conductance electrode causes chilled water vacuolation, and the fouling on window side conductance electrode surface is cleaned.When fouling is serious, can manually presses start button SB1 startup radio-frequency generator circuit conductance electrode is cleaned.
Claims (5)
1. a self-cleaning water quality signalling means, comprise probe, power module (5), signal processing module (7), high frequency signal generator module (8), timer module (9), power module (5) drives signal processing module (6), timer module (7), high frequency signal generator module (8) work, power module (5) connects signal processing module (7), signal processing module (7) connects timer module (9), timer module (9) connects high frequency signal generator module (8), probe is connected with heat interchanger by housing, conductance electrode in probe (4) is connected with signal processing module (7) by lead-in wire (2), piezoelectric ceramics crystal-vibration-chip (3) in probe is connected with high frequency signal generator module (8) by lead-in wire (2).
It is characterized in that probe comprises epoxy resin housing (1), lead-in wire (2), conductance electrode (4), piezoelectric ceramics crystal-vibration-chip (3) forms, piezoelectric ceramics crystal-vibration-chip (3) is arranged on conductance electrode (4) back side, and with epoxy resin die casting together, between conductance electrode (4) and piezoelectric ceramics crystal-vibration-chip (3), pass through epoxy resins insulation, in the middle of epoxy resin housing, have window, guarantee that conductance electrode (4) contacts with chilled water, two conductance electrodes (4) respectively with conductance electrode contact b1, b2 joins, the piezoelectric ceramics crystal-vibration-chip (3) of two parallel connections ipsilateral not respectively with piezoelectric ceramics contact a1, a2 is connected, piezoelectric ceramics crystal-vibration-chip carries out timing or manually starts cleaning conductance electrode.
2. self-cleaning water quality signalling means according to claim 1, it is characterized in that, power module (5) is comprised of transformer T, rectifier ZVD, Voltage stabilizing module (9), capacitor C1, C2, transformer T is 12V alternating current by the step-down of 220V alternating current, by bridge rectifier ZVD, by 12V AC rectification, be Rectified alternating current, after the filter regulator circuit filtering forming through capacitor C1, C2, three-terminal voltage-stabilizing module 9, voltage stabilizing, obtain 12V constant voltage source, drive signal processing module 6, timer module 7, high frequency signal generator module 8.
3. self-cleaning water quality signalling means according to claim 1 and 2, it is characterized in that, described signal processing module (6) is comprised of resistance R 1, R2, R3, R4, variable resistor PR1, integrated operational amplifier J1, power switch pipe V1, diode VD1 and relay K, and variable resistor PR1 and resistance R 1 form bleeder circuit, integrated operational amplifier J1 and resistance R 2, R3, R4 form rp-op amp, wherein R2 is in-phase end input resistance, R3 is stake resistance, and R4 is in-phase end and the output terminal that feedback resistance is connected on integrated operational amplifier J1, between conductance electrode power supply and end of oppisite phase, the base stage of power switch pipe V1 is connected on the output terminal of integrated operational amplifier J1, diode VD1 and relay coil K are connected on power switch pipe V1 collector, VD1 is fly-wheel diode, by standard water quality, demarcate the resistance of variable resistor PR1, demarcate the in-phase end current potential of integrated operational amplifier J1, when change of water quality to a certain extent, the saturated output of integrated operational amplifier J1, driving power switching tube V1 saturation conduction, connect contactor coil K circuit, contactor drives warning device to report to the police or starts treatment device for water and carries out water treatment, when power switch pipe turn-offs, contactor coil K is by diode VD1 release current.
4. self-cleaning water quality signalling means according to claim 1 and 2, it is characterized in that, timer module (7) is by resistance R 5～R12, variable resistor PR2, capacitor C3～C5, unijunction transistor KV1, KV2 and thyristor GT1 form, unijunction transistor KV1 and capacitor C3, resistance R 5, R6, variable resistor PR2 forms first order trigger circuit, power supply makes C3 potential rise by variable resistor PR2 to capacitor C3 charging, when capacitor C3 current potential surpasses the evoked potential of unijunction transistor KV1, KV1 conducting, C3 is by unijunction transistor KV1, resistance R 6 electric discharges, C3 current potential reduces, when C3 current potential lower than unijunction transistor KV1 maintain voltage time, unijunction transistor KV1 cut-off, diode VD2, capacitor C4, resistance R 7～R9, unijunction transistor KV2 form second level trigger circuit, when KV1 conducting, power supply charges to capacitor C4 by R5, unijunction transistor KV1, diode VD2, when capacitor C4 current potential surpasses the evoked potential of unijunction transistor KV2, unijunction transistor KV2 conducting, C4 is by 9 electric discharges of resistance R 7, unijunction transistor KV2, resistance R, when the current potential of capacitor C4 lower than unijunction transistor KV2 maintain voltage time, unijunction transistor KV2 cut-off, when unijunction transistor KV2 conducting, by resistance R 10, to thyristor GT1, control utmost point output trigger pip, thyristor GT1 conducting, to radio-frequency generator module output trigger pip, after thyristor conducting, power supply is by resistance R 11, thyristor GT1, resistance R 12, to capacitor C5 charging, make the lifting of capacitor C5 current potential, potential difference (PD) between thyristor GT1 negative electrode and anode is reduced, when thyristor GT1 negative electrode, between negative electrode, potential difference (PD) is less than while maintaining voltage, thyristor GT1 cut-off, the resistance of adjusting variable resistor PR2 can change the output recurrence interval of first order unijunction transistor trigger circuit, thereby change the time interval of whole timer module output trigger pip.
5. self-cleaning water quality signalling means according to claim 1 and 2, it is characterized in that, described high frequency signal generator module (8) is comprised of Schmidt trigger module 10, capacitor C6, resistance R 13, Schmidt trigger 10 and capacitor C6, resistance R 13 form without stable state self-maintained circuit, output high-frequency pulse signal, when the far-end control end of schmidt trigger module 10 receives the control signal of thyristor GT1 output, without stable state self-maintained circuit, start working, produce high-frequency pulse signal, by terminals b1, b2 is transferred to the piezoelectric ceramics crystal-vibration-chip in probe, there are vibrations and produce ultrasound wave in piezoelectric ceramics crystal-vibration-chip, ultrasonic propagation is to conductance electrode, cause conductance electrode vibrations, window side at conductance electrode causes chilled water vacuolation, fouling to window side conductance electrode surface is cleaned, when fouling is serious, can manually press start button SB1 startup radio-frequency generator circuit cleans conductance electrode.
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Application publication date: 20140416 |